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From "Alan Conway (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (QPID-4428) HA add UUID tag to avoid using an out of date queue.
Date Wed, 14 Nov 2012 16:08:11 GMT

     [ https://issues.apache.org/jira/browse/QPID-4428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alan Conway resolved QPID-4428.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 0.19

Fixed on trunk:
r1409241 | QPID-4428: HA add UUID tag to avoid using an out of date queue/exchange.
                
> HA add UUID tag to avoid using an out of date queue.
> ----------------------------------------------------
>
>                 Key: QPID-4428
>                 URL: https://issues.apache.org/jira/browse/QPID-4428
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Clustering
>    Affects Versions: 0.19
>            Reporter: Alan Conway
>            Assignee: Alan Conway
>             Fix For: 0.19
>
>
> Here's the scenario: we have a cluster with primary A and backups B and C. There is a
queue Q that is replicated to both. Now A dies and B takes over as primary. Before C has connected
to B, a client destroys Q and creates a new queue with the same name, Q. When C does connect
it sees a queue named Q and mistakenly assumes it is the same queue as it's own Q - so it
has an incorrect replica of Q. The same scenario applies to exchanges.
> The fix is to tag queues and exchanges with a UUID, so backups can identify that the
queue has changed even if the name is the same.

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